Process for hydrogenation of 1,3-butadiene
AssigneeLyondell Chemical Technology, L.P.
InventorsSarthak Gaur, Daniel F. White
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Abstract
Methods of improving the selectivity of selective hydrogenation of residual 1,3-butadiene in a C4 fraction of a hydrocarbon raffinate stream in a fixed-bed reactor are described. The methods may include co-feeding a competitive chemical species that increases the mechanistic selectivity to 1- and 2-butenes while increasing isomerization selectivity to 2-butene in the product stream. The hydrogenation reactor and competitive chemical species conditions may be tailored to selectively produce butenes over butane or iso-butane, where the butenes comprise 1-butene and/or 2-butene.
Claims20
A method of selectively hydrogenating 1,3-butadiene, comprising:
- a) combining a hydrogen gas stream and a gas stream containing at least one competitive chemical species to form a combined stream, wherein the molar ratio of said competitive chemical species to said hydrogen gas is between 0.0001:1 and 0.02:1;
- b) co-feeding a mixed olefin stream containing 1,3-butadiene with said combined stream into a hydrogenation reactor unit, wherein said hydrogenation reactor unit is packed with a heterogeneous hydrogenation catalyst and is operated in the liquid or gas phase;
- c) reacting said streams in the presence of said heterogeneous hydrogenation catalyst;
- and,
- d) converting said 1,3-butadiene to n-butane and at least one butene, wherein the molar ratio of butene to n-butane is between 40:1 to 80:1.
A method of selectively hydrogenating 1,3-butadiene in a mixed olefin stream comprising:
- a) combining a hydrogen gas stream and a gaseous stream containing a competitive chemical species to form a combined stream, wherein the ratio of said competitive chemical species to said hydrogen gas is between 0.0001:1 and 0.001:1;
- b) co-feeding a mixed olefin stream containing 1,3-butadiene with said combined stream into a hydrogenation reactor unit, wherein said hydrogenation reactor unit is packed with a heterogeneous catalyst and is operated in the liquid or gas phase;
- c) reacting said streams with said heterogeneous hydrogenation catalyst;
- and,
- d) converting said 1,3-butadiene to n-butane and at least one butene, wherein the molar ratio of butene to n-butane is between 40:1 to 80:1.
Dependencies are inferred from the claim text.